The relevant fragment of the worker log appears to be as below.  What could this be caused by?  Is there a possible workaround / solution?

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2018-09-13T23:46:00.234+01:00 info vmware-converter-worker[05116] [Originator@6876 sub=task-3] Starting system reconfiguration …

2018-09-13T23:46:00.234+01:00 info vmware-converter-worker[05116] [Originator@6876 sub=Default] Using temp dir C:WINDOWSTEMPvmware-tempvmware-SYSTEMsysReconfig

2018-09-13T23:46:00.281+01:00 info vmware-converter-worker[05116] [Originator@6876 sub=task-3] ReconfigurationTransaction: cached guest system volume

2018-09-13T23:46:00.281+01:00 info vmware-converter-worker[05116] [Originator@6876 sub=task-3] ReconfigurationTransaction: cached guest system volume

2018-09-13T23:46:00.281+01:00 info vmware-converter-worker[05116] [Originator@6876 sub=task-3] LocalPathToGuestSystemFolder: .vstor2-mntapi20-shared-8C73F4D0000010000000000005000000WINDOWS

2018-09-13T23:46:00.281+01:00 info vmware-converter-worker[05116] [Originator@6876 sub=task-3] LocalUndoFolder: .vstor2-mntapi20-shared-8C73F4D0000010000000000005000000WINDOWS$Reconfig$

2018-09-13T23:46:00.828+01:00 info vmware-converter-worker[05116] [Originator@6876 sub=Default] [LoadTempHive] Registry hive .vstor2-mntapi20-shared-8C73F4D0000010000000000005000000WINDOWSsystem32configSYSTEM is loaded under the name mntApi233162130830690227

2018-09-13T23:46:02.109+01:00 info vmware-converter-worker[05116] [Originator@6876 sub=Default] [LoadTempHive] Registry hive .vstor2-mntapi20-shared-8C73F4D0000010000000000005000000WINDOWSsystem32configSOFTWARE is loaded under the name mntApi233646505830690227

2018-09-13T23:46:02.109+01:00 info vmware-converter-worker[05116] [Originator@6876 sub=task-3] Populating predefined expressions …

2018-09-13T23:46:02.109+01:00 info vmware-converter-worker[05116] [Originator@6876 sub=task-3] Processing user-defined expressions …

2018-09-13T23:46:02.109+01:00 info vmware-converter-worker[05116] [Originator@6876 sub=task-3] Evaluating registry expression, Key = CurrentControlSetServicesACPIValueName StartValueType 1 dataPattern 0

2018-09-13T23:46:02.109+01:00 info vmware-converter-worker[05116] [Originator@6876 sub=task-3] Evaluating registry expression, Key = MicrosoftWindows NTCurrentVersionValueName CurrentTypeValueType 0 dataPattern Multiprocessor.*

2018-09-13T23:46:02.125+01:00 info vmware-converter-worker[05116] [Originator@6876 sub=task-3] Evaluating registry expression, Key = CurrentControlSetControlCriticalDeviceDatabaseprimary_ide_channelValueName ServiceValueType 0 dataPattern atapi

2018-09-13T23:46:02.125+01:00 info vmware-converter-worker[05116] [Originator@6876 sub=task-3] Evaluating registry expression, Key = CurrentControlSetControlCriticalDeviceDatabasesecondary_ide_channelValueName ServiceValueType 0 dataPattern atapi

2018-09-13T23:46:02.125+01:00 info vmware-converter-worker[05116] [Originator@6876 sub=task-3] Applying reconfigurations …

2018-09-13T23:46:02.156+01:00 error vmware-converter-worker[05116] [Originator@6876 sub=task-3] Error 2 (opening key) saving registry key mntApi233162130830690227ControlSet001Servicesrhelfltr into .vstor2-mntapi20-shared-8C73F4D0000010000000000005000000WINDOWS$Reconfig$mntApi233162130830690227-ControlSet001-Services-rhelfltr-reg

2018-09-13T23:46:02.250+01:00 error vmware-converter-worker[05116] [Originator@6876 sub=task-3] Error 5 (error restoring key: Access is denied (5)) restoring registry key C:Program FilesVMwareVMware vCenter Converter StandalonedataSKUNKWORKS_FILLER into mntApi233162130830690227ControlSet001Servicesrhelfltr

2018-09-13T23:46:02.250+01:00 error vmware-converter-worker[05116] [Originator@6876 sub=task-3] Reconfiguration failed with: vim.fault.NoPermission

2018-09-13T23:46:02.250+01:00 info vmware-converter-worker[05116] [Originator@6876 sub=task-3] Rolling back the reconfiguration transaction…

2018-09-13T23:46:02.250+01:00 info vmware-converter-worker[05116] [Originator@6876 sub=task-3] Deleting pending files…

2018-09-13T23:46:02.250+01:00 info vmware-converter-worker[05116] [Originator@6876 sub=task-3] Writing the undo log …

2018-09-13T23:46:02.328+01:00 info vmware-converter-worker[05116] [Originator@6876 sub=Default] Unloaded hive mntApi233646505830690227

2018-09-13T23:46:02.359+01:00 info vmware-converter-worker[05116] [Originator@6876 sub=Default] Unloaded hive mntApi233162130830690227

2018-09-13T23:46:02.359+01:00 info vmware-converter-worker[05116] [Originator@6876 sub=Default] Cleaning up temp directory C:WINDOWSTEMPvmware-tempvmware-SYSTEMsysReconfig …

2018-09-13T23:46:02.359+01:00 error vmware-converter-worker[05116] [Originator@6876 sub=task-3] TaskImpl has failed with MethodFault::Exception: converter.fault.ReconfigurationFault

2018-09-13T23:46:02.359+01:00 error vmware-converter-worker[05116] [Originator@6876 sub=Default] Task failed: